Via KurzweilAI.net — And if quantum amnesia is a real phenomena without a solution time travel would be a one-way affair. I’m not sure if anyone would sign up for a one=way ticket to an uncertain future.

Quantum amnesia gives time its arrow

NewScientist Physics & Math, Aug. 26, 2009

The forward-only direction of time is the result of quantum-mechanical amnesia that erases any trace thattime has moved backwards, says Lorenzo Maccone of MIT.

Short Sharp Science (NewScientist blog), Oct. 22, 2008The Army is looking for contractors to provide a “Multi-Robot Pursuit System” that will let packs of robots “search for and detect a non-cooperative human.”

Jamming the right two pieces of plastic together creates a thin but strongly conducting channel along the junction that acts like a metal, say Dutch researchers. The discovery could lead to a whole new way of making electronics from non-metallic materials, and even new superconductors.

Alberto Morpurgo’s team at Delft University of Technology in the Netherlands attached a micrometer-thick crystal of the organic polymer TTF to a similarly thin organic crystal of the polymer TCNQ.

The thin, flexible crystals conform to each other’s shape and stick together due to van der Waals forces, says Morpurgo.

Metal surprise

Both TTF and TCNQ are electrical insulators. But Morpurgo’s team found that a 2-nanometre-thick strip along the interface between the two crystals conducts electricity as well as a metal.

A new scanning electronmicroscope (SEM) design by physicist Derek Eastham could achieve a resolution around four times better than existing SEMs–as low as 0.01 nanometers (roughly the distance between a hydrogennucleus and its electron).

It also produces a beam with about 100 times less energythan usual in an SEM, lowering the cost and possibly allowing it to study delicate structures normally destroyed by electron microscopes, such as untreated proteins and DNA.

April 8, 2008

This is a sobering bit of conjecture. A hypothetical exhange of 100 15-kiliton nuclear weapons (Hiroshima-sized) could pretty much wipe out the ozone layer.

From the NewScientist link:

Apart from the human devastation, a small-scale nuclear war between India and Pakistan would destroy much of the ozone layer, leaving the DNA of humans and other organisms at risk of damage from the Sun’s rays, say researchers.

Michael Mills of the University of Colorado at Boulder, US, and colleagues used computer models to study how 100 Hiroshima-sized bombs would affect the atmosphere.

They say that their scenario – in which each country launches 50 devices of 15 kilotons – is realistic, given the countries’ nuclear arsenals.

“The figure of 100 Hiroshima-sized bombs compares pretty accurately to the approximately 110 warheads that both states reportedly possess between them,” agrees Wyn Bowen, professor of non-proliferation and international security in the War Studies Group at King’s College, UK.